Improvement in alloys to resemble silver



UNITED STATES PATENT QFFICE.

ADELE ELISE PIRSOH-BAUDVIN, OF PARIS, FRANCE.

IMPROVEMENT INIALLOYS TO RESEM'BLE SILVER.

Specification forming part of Letters Patent No. 142,760, dated September 16, 1873; application filed May 29, 1873.

ver more closely than any alloys heretofore. produced in color, specific gravity, malleability, ductility, ring, and general characteristics. For these purposes the following metals are combined: Copper, nickel, tin, zinc, cobalt, and iron.

The following proportions are suitable, and

produce a very white and silver-like metal:

Copper 71.00 parts.

.Nickel. 16. 50 parts.-

Oobalt 1. 75 parts.

Tin 2. 50 parts.

Iron 1. 25 parts. 1

Zinc 7.00 parts.

In some cases, also, a small proportionsay,

to ten of the latter. The nickel alloy, the iron,

the remainder of the copper, the cobalt in the state of black oxide,) and charcoal are then placed together in a plumbago crucible. The charge is covered witlrcharcoal and the whole is exposed to a high heat. -When the materials are melted the heat is reduced and the alloy ofzinc and copper is added when the heat is such that it will just melt freely. This having been done, the crucible is taken from the fire and stirred with a rod of hazelwood. The tin is then added. Itis Wrapped in pa- I ver-like alloys depends mainly upon the influence of cobalt. If the cobalt be omitted from the alloy it will cease to have a silver-like appearance. 1 V

What I claim as my invention is- The manufacture of an alloy resembling silver, substantially in the manner described.

' ADELE ELISE PIRSGH-BAUDVIN.

Witnesses M. TAUSSUPANSE, A. LAFAGSE. 

